There used to be a name for what I was doing, "lurking" -- it dates back to a very different time in the net's history, when usenet and mailing lists were the main forms of communication. It was hard to talk about lurkers then, for the obvious reason that no one knew much about them; it hasn't gotten much easier since.
Les indispensables du web 2.0 : del.icio.us. Après Netvibes, nous continuons notre d'horizon des indispensables du web 2.0.